package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetmealMapper setmealMapper;
    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //判断要加入的东西是否存在
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());

        List<ShoppingCart> list=shoppingCartMapper.getByInfo(shoppingCart);

        //存在的话，数量加一即可
        if(list!=null && list.size()>0){
            ShoppingCart cart=list.get(0);
            cart.setNumber(cart.getNumber()+1);
            shoppingCartMapper.updateNumberById(cart);
        }else {
            //不存在的话，判断一下添加进来的是套餐还是菜品
            Long dishId = shoppingCartDTO.getDishId();
            if(dishId!=null){
                //说明传来的是菜品
                Dish dish = dishMapper.getById(shoppingCartDTO.getDishId());
                shoppingCart.setName(dish.getName());
                shoppingCart.setAmount(dish.getPrice());
                shoppingCart.setImage(dish.getImage());
            }else {
                //说明传来的是套餐
                Setmeal setmeal = setmealMapper.getById(shoppingCartDTO.getSetmealId());
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setAmount(setmeal.getPrice());
                shoppingCart.setImage(setmeal.getImage());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());

            //插入到数据库
            shoppingCartMapper.insert(shoppingCart);
        }

    }

    /**
     * 查看购物车
     * @return
     */
    @Override
    public List<ShoppingCart> getShoppingCart() {
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart= ShoppingCart.builder()
                                .userId(userId)
                                .build();
        return shoppingCartMapper.getByInfo(shoppingCart);
    }

    /**
     * 清空购物车
     */
    @Override
    public void cleanShoppingCart() {
        shoppingCartMapper.cleanShoppingCart();
    }


    /**
     * 删除购物车的一个商品
     * @param shoppingCartDTO
     */
    @Override
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //判断传入的东西数量是否大于一
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());

        List<ShoppingCart> list=shoppingCartMapper.getByInfo(shoppingCart);
        ShoppingCart cart=list.get(0);
        int number=cart.getNumber();
        //大于一的话，数量减一即可
        if(number>1){
            cart.setNumber(number-1);
            shoppingCartMapper.updateNumberById(cart);
        }
        else{
            //小于等于的话，直接删除即可
            shoppingCartMapper.delete(shoppingCart);
        }

    }
//    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
//        ShoppingCart shoppingCart = new ShoppingCart();
//        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
//        //设置查询条件，查询当前登录用户的购物车数据
//        shoppingCart.setUserId(BaseContext.getCurrentId());
//
//        List<ShoppingCart> list = shoppingCartMapper.getByInfo(shoppingCart);
//
//        if(list != null && list.size() > 0){
//            shoppingCart = list.get(0);
//
//            Integer number = shoppingCart.getNumber();
//            if(number == 1){
//                //当前商品在购物车中的份数为1，直接删除当前记录
//                shoppingCartMapper.deleteById(shoppingCart.getId());
//            }else {
//                //当前商品在购物车中的份数不为1，修改份数即可
//                shoppingCart.setNumber(shoppingCart.getNumber() - 1);
//                shoppingCartMapper.updateNumberById(shoppingCart);
//            }
//        }
//    }
}
